** FILE ** Japanese scientist Shinya Yamanaka (left) and British researcher John Gurdon, winners of the 2012 Nobel Prize in medicine, speak to each other at a symposium in Tokyo in April 2008. (AP Photo/Kyodo News)
** FILE ** Japanese scientist Shinya Yamanaka (left) and British researcher John Gurdon, winners of the 2012 Nobel Prize in medicine, speak to each other at a symposium in Tokyo in April 2008. (AP Photo/Kyodo News)
